Evaluating Static Analysis of the Damper Grommets for Compressor

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 220
Evaluating Static Analysis of the Damper Grommets for Compressor
Vivek P1, Dr. B Ravindra2
1Deparment of Mechanical Engineering, Dr Ambedkar Institute of Technology, Karnataka, India
2 Professor, Department of Mechanical Engineering, Dr Ambedkar Institute of Technology, Karnataka, India
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Abstract – Ain basically the grommets are hole string like
structures made up of rubber andmanyotherelastic materials
these are mainly used to reduce the vibration of the
reciprocating machines. Especially in the house holding
refrigeration and air cooler. In refrigeration working
condition the compressor are producing some noise. This
sound is irritating the people in the house. When the
compressor are in working it compress the water with low or
high pressure and it reciprocates the weightofthecompressor
is directly applied on the base plate. Whencompressor instatic
condition whole weight of the compressorisfullyappliedforce
on the grommets. But the application of force grommets vary
the with the static response with respect to the load. In this
type of grommets material is vulcanized rubber prepared by
ASTM D412 test method. The value of the grommets vary with
material properties and especially considering the
displacement and the stress. The displacement results
obtained from the testing is notified. And we are simulating
the grommets position vary with the loads. And finding the
values of the displacement and stress value of the simulation
method .and this simulation is done by ABAQUS software.
Finally compare the both the displacement and stress value.
Key Words: grommets, compressor, vibration, static
response, ASTM D412, simulation,displacement,stress,
1. INTRODUCTION
Compressors are the fundamental hardware of refrigeration
units, for example, ventilation systems and coolers.
Responding compressors are one of the for the most part
utilized sorts of compressors since they can accomplish a
high weight proportion at a low vitality input. In any case,
the cyclic development of cylinders in the responding
compressors brings about mechanical vibration that can
cause undesirable commotions. To dispose of the
commotion, grommets are introduced as auxiliary backings
for confining the vibration sources, i.e., the compressors,
from the beginning. The grommets are normally or
essentially made of elastic since they have adequate
solidness to withstand the heavinessofthecompressorsand
can diminish the size of vibration by scattering the vibration
vitality as warmth while being consistently deformed.4
Fig-1 Compressor Used In Small Commercial Refrigeration
To limit the clamour, grommets are introduced as auxiliary
backings for disengaging the vibration sources, i.e., the
compressors, starting from the earliest stage.Thegrommets
are essentially made of elastic since they have adequate
solidness to withstand the heavinessofthecompressorsand
can lessen the size of vibration by disseminating makers,
while the grommet makers just fill in as made-to-arrange
providers. To build the estimation of grommet and to limit
the assembling cost, an orderly grommet plan system must
be produced for the business.
Fig-2 Common features of a rubber grommet
The business elastic grommets are accessible in a vast scope
of geometry and solidness. In the responding compressors
for family coolers, in any case, some basic components in
elastic grommets are watched:

A grommet has a top head and an opening for embedding
into a gap at the base of a compressor.
The part beneath the opening is the shoulder territory for
resting the base piece of a compressor,
The part under the shoulder is the base, and
At the mid piece of a grommet there is an opening for
embedding a jolt that bolts the grommet to the ground
support of the compressor
1.1 Materials used to produce grommets
Collection of material are used to create grommets, for
instance, metal, plastic, and versatile materials. Metal is the
primarily used materials. It gives awesome quality, and
staggering high temperature malleability, sensible cold
adaptability, extraordinary bearing properties and low
appealing permeability, incredible electrical conductivity,
astonishing disintegration resistance, Nickel composites
contain nickel and no less than one distinct metals, for
instance, copper. Steel, a business press contains carbon in
any entirety up to around 1.7 percent, is flexible under
suitable conditions and perceived from cast press by the two
its flexibility and lower carbon content. Stainless steel is
engineered and utilizationsafeandcanhaverespectablyhigh
weight assessments. Butyl, a run of the mill term for the
isobutylene isoprene elastomer, is impenetrable to water,
steam, dissolvable bases, and oxygenated solvents. Butyl has
low gas entrance and high-imperativeness osmosis (hosing)
and moreover incredible hot tear quality. Styrene Butadiene
Rubber (SBR) and Nitrile are used with most oils, water
driven fluids and alcohol. A many sorts of select blends are
open for specific applications.
1.2 How to Select a Grommet
Assurance of grommets requires an examination of some
physical points of interest. Inside width (ID) is the opening
breadths through the centerreasonforthegrommet.Wrinkle
width related to the thickness of the material into which sort
grommets are inserted. Inside separation crosswise over of
the grommets is called woods estimation. Other physical
conclusions are considered for grommets join as a rule and
outside separation crosswise over (OD) or length, thickness.
Width is a fundamental physical estimation for oval, oval,
square and rectangular sort grommets. The units for
measuring the grommets in inches (in). Centimeters (cm)
moreover used to gage the grommets
1.2.1 Standards
Promotions AS1902 - Cable grommets
Promotions AS44404-406 - Elastomeric grommets
(different), for aeronautical purposes
AN231 - Grommet and waste, plastic
1.3 Application of rubber grommets
 he Elimination of Sharp Edges
 Aesthetic appeal
 Varied Sizes
 Water Resistance
 Vibration Damping
 Desk Grommets
2. MATERIAL PROPERTIES
2.1.1 Measuring Material Properties
Since the state of elastic grommets does notpermitstandard
test techniques for measuringmaterial properties,a demand
is made to the grommet maker to give the elastic in a type of
a sheet. The elastic sheet is tried under two conditions: the
versatile properties are measured from uniaxial tractable
tests and the gooey properties are measured from push
unwinding tests. The two tests utilize elastic examples
arranged by ASTM D412. The tractable test examples are
stacked at a crosshead speed of 500 mm/min. The
unwinding tests are led by at first extendingtheexampletoa
25% ostensible endure a speed of 500 mm/min and
afterward holding for 600 seconds. The test outcomes
appeared in Fig. 6 and 7 for the ductile test and the
unwinding test demonstrate a runofthemill nonlineartime-
subordinate conduct of an elastomer
2 EXPERIMENTAL PROCEDURE
Fig-3 standard type of universal testing machine
Fig-4 ASTM D412 model specification

Analysis obtained:
Stress at specified or required elongation
Tensile or compressive Yield Stress
Tensile or compressive Yield Strain
Tensile or compressive Strength at Rupture or break point
Elongation of the Rupture
Equipment required:
1. Universal testing machine (tensile testing machine) is the
basic testing machine to finding the any of the material
property related to the material with the fallowing
specification
A. Servo-controlled is the basic device to maintain the
constant speed .the rate of speed to(+/-2inches/min)
B. minimum 30 inches of crosshead travel with high
elongation materials
C. Most common 1kN (225 pound) load carrying capacity
machines is required to the tested machine.
The larger part of our eXpert2600 course of action twofold
segment machines meet these essentials, and it is in like
manner standard to use our single section eXpert7601 XL
with 53 creeps of crosshead travel.
2. An extensometer is optional however recommended. We
recommend one for two reasons. To begin with, dumbbell
cases don't have uniform widths which cause goofs when
both the wide and limited ranges of the dumbbell framed
case reach out at different rates. Besides, prolongation is
regularly a basic layout typical forrubbersandelastomersso
an extensometer can be used to upgrade exactness of the
estimation.
3. Programming or sensible devices arerequiredtowork the
machine and to take the estimations. Majorsystemswill give
the unrefined data, and stress-strain diagrams. Using these
wellsprings of data, you can choose and learn most of the
examination recorded beforehand. Nevertheless, totally PC
based structures can figure these normally.Forexample, our
MTEST Quattro testing programming has worked inhelpfor
ASTM D412 and these calculations are given rapidly
consequent to playing out the test.
4. Pliant handles hold your case in the midst of the test as it
is being pulled isolated. Elastomers speak to a test to hold
since they thin as they are extended. Likewise, by a wide
margin the greater part of elastomers ought to be held with
self-settling holds. Instances of these holds are odd roller
handles, wedge holds, or pneumatic handles. Regardless of
the hold design, the thought is the same - they settle on the
material as it decreases to keep predictable constrain on the
case.
Specimen identifier 6
Width 0.25150 in or 6.3881 mm
(1inch =25.4mm)
Thickness 0.1028 in or 2.6112mm
Axial strain gauge length 1.00 in 25.4mm
Area 0.0269sq in or
0.17.3548sqmm
Maximum Load 17.64lb or 78.466 N (1lb
=4.4482N)
Analysis results
ASTM D412
Tensile or compressive yield stress 661.0psi
or 4.5574 N/mm2
Tensile or compressive yield strain 4.636 in
Tensile or compressive rupture or breaking strength 678.0
psi or 4.674 N/mm2
Auto elongation at break
Gauge length 1.00in or 25.4mm
Elongation 454.49%
Young’s modulus 0.01 to 0.1Mpa
Fig-5 Stress strain curve of the ASTM D412
3 Theoretical Calculations
3.1 Finding the density of the selected rubber grommet
Fig-6 Geometric parameter of the grommets
To finding the density of the grommets is divided into five
cylindrical shapes. It is easy to determine volumeofthe each
parts of the grommets and finding the each parts volume
add the four volumes and getting the total volume of the
grommet and finding the inner radius of the grommets and

subtracted total volume by inner radius of inner volume we
get the reaming volume is the grommets volume
Density of the grommet (ρ) = volume of the grommets (v) /
total mass of the grommets (m)
ρ = v/m
3.83/ 12.8
1447 mm3 (or) 1.447 tons / mm3
4. OBJECTIVES AND METHODOLOGY
4.1Objectives
The principle destinations of the present work is to explore
the impact of static and dynamic examination of grommets
for responding compressor .keeping in mind the end goal to
finding the aggregate impact of vibration reaction of the
compressor mounting framework
 Analyze the vibration reaction of grommets of
responding compressor utilized as a part of little
refrigeration
 Determine the significant basic repeat of the
mounting vibration structure in each one of the an
essential bearing
 Finding the statically analysis values and the
compressor mounting in the materials
 Analyzing the behavior of the grommets in the in
static condition
 Comparison of the results with the simulation
results
5 METHODOLOGY
5.1 Problem Definition
The goal of this venture is to investigations and enhance
geometry of elastic grommet for compressors utilized as a
part of little coolers. The elastic grommets are utilized as
vibration isolators that diminish the greatness of vibration
because of the intermittent movement of dynamic segments
in the compressors
5.2 Flow Chart for Methodology
 Creating a geometric model of Grommets in
SOLIDE WORKS
 The weight of compressor is modeled as lumped
mass at its CG location.
 Discretizing geometric model using ABAQUS
 Application of loads and boundary condition
 Linear static and structural analysis using
ABAQUS
 Finding the results of the analysis solution
 Comparing the analysis results with experimental
and simulation results
5.3 Cad Model
Fig-7 Geometric modeling of Grommet
Fig-8 Front and top view of Grommet
5.4 Meshing
Figure 9 shows the Finite Element model generated for the
geometric model of the Grommet structure using linear
hexahedral elements. These elements are selected because
the quadratic result interpolation at the integration point.in
this messing element number of elements are used to
finding the value of the applied force on the grommet base.
Mainly the process of messing is to discretizingtheelements
in to many equal number of elements. And the elements are
considering the equal in size and shapes
Table No. 4.1 Elements and nodes count
TYPE OF ELEMENT linear hexahedral
elements (C3D8R)
TOTAL NUMBER OF NODES 20448
TOTAL NUMBER OF
ELEMENTS
17208

Fig-9 Mesh model of Grommet
5.5 Assembly of Meshed Grommet
Fig-10 Assembly of the grommets with BC
The distance between the two grommets is 102 mm and
the length is of 165 mm. The CG point is located at 64mm
to X axis and 34 mm to axis and 50mm to Y direction
5.6 Loading Condition
Fig-10 Loading condition of grommets
The load of compressor of 8.41kg is applied on CG point. The
tie boundary condition is applied to the inner surface of the
grommets to the BC point. Gravity acts along the -ve Y axis
for all the grommets.
6 RESULTS AND DISCUSSION
6.1 Linear Static Analysis
The FE model of grommet structure with loads and
boundary conditions was run for analysis in ABAQUS.
6.1.1 Displacement Plot for Static Analysis
The FE model of grommet structure with loads and
boundary conditions was run for analysis in ABAQUS. The
following figures give the results of both static and model
analysis. For static analysis displacements and stresses are
obtained and for model analysis different modes of
frequencies are obtained.
Fig-11 Displacement plot for static analysis
6.1.2 Stress Plot for Static Analysis
Fig-12 Stress plot for static analysis
7 CONCLUSION AND FUTURE SCOPE
7.1 Conclusion
 The maximum stress in the segment is found in the
experimental 4.58Mpa and in the simulation result
is 1.2Mpa.
 By obtaining the above results design of the
grommets is safe and it also possible to carry 200
percent of load

 And also considering the elongation of this rubber
materials is 454 percent elongation is possible.
 The simulation stress is withinfailurestressandthe
rubber grommet is safe.
 Displacements are found to be within limits in
experimental 4.5 mm and after simulation 1.5 mm
7.2 Scope of Future Work
 Reduce the stiffness of the grommet because low
stiffness are not always desirable and thy are
sustain weight of the compressor
 Determine the fatigue life of the grommets
 Finding the product life cycle of the grommet
 Dynamic response analysis shell be performed for
the input acceleration spectrum.
 Optimizing the given results using the mechanical
softwar
REFERENCE
[1] Zaidi Mohd Ripin and Ooi Lu Ean, Dynamic
characterization of engine mount at different orientation
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[2] Aleks Kuyumcuoglu, Ozgun Sakalli Arcelik A.S. Ankara
Asfalti investigation of vibration transmission Properties of
compressor grommets in Domestic refrigerators
34950 Tuzla, Istanbul, Turkey
[3] Embraco, Carlos Eduardo Vendrami Analysis of
Vibration Isolators for Hermetic
Compressors Brazil, Claudio Pellegrini
[4] G. Lampugnani Aspera Compressor Noise Reductionona
Refrigerator 1994 Yuki Tanaka*, keigo matsushima,
Yoshinao kobayashi, Masaru shitamichi,
[5] Koji miyajima, hidemi Tanigawa and koji ota Practical
Use of Computer-Aided Engineerin in the Development of
Automotive Rubber Grommets
[6] Xianpai Zeng, Jared Liette, Scott Noll, and Rajendra Singh
Analysis of Motor Vibration Isolation System with Focus on
Mount Resonances for Application to Electric Vehicles Ohio
State University
[7] David Koblar1, Miha Bolte_zar2 Evaluation of the
frequency-dependent Young's Modulus and damping factor
of rubber from Experiment and their implementation in
anite-element analysis
[8] T. S. Dol*, D. N. Korade, P. D. Darade, K. R. Jagtap Narhe,
Design Development and Testing of Hydraulic EngineMount
Isolation in Agricultural Applications Mechanical
Engineering Department, Sinhgad Institute of Technology
and Science, Pune, Maharashtra India

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